Table of Contents
Advertisement
17.7
ELECTRONIC IGNITION
The
electronic
ignition
device
requires
pralically no
maintenance as it consi
st
s of parts
(lot
subjoct
to
mechanical wear.
According
ly
no periodic al
se rvicing is needed excopt
to
any
eleclron
ic
component (electron
ic boxes
or
pickups) or in the
electrical
c onnections.
a
Operati
on
W
ith
the ig
nition
c
i
rcuit
c
losed
,
the
c urrent
f(om
the
battery passes
through
the
electronic
switch
(tr ansi.
s to
r)
inside
the e
lect
ronic box
",nd
goes
to the
p
rima-
ry
c
ircuit
0
1
the
ignition
coil.
During
the
rotatio
n 01
the
rotor,
w
hen
the
metal
b
lock
..
A
.. o
n
the
same
ge
ls
near
the
mel",!
l
ips 0
1
magne lic
pic
kup
..
8"
.
thi
s
w
rit gene
ra
te an
e
lect
ric imp
ulse
the'll
goes to
Ihe
transistor
inside
the box
(See
l
ig.
167
and
171),
caus·
~
n
g
the
p
rimary
circui
l 0
1
t he
coil
to
be cu
t
off.
Accordingly
.
the high
tensi
on
requi
red lo
r
the
igni·
ti
on
is gene
ra
ted
in
the
secondary
winding of
the
coil
Itse
ll. From
here
it
goes
10
spark plug
~B"
Ih rough
,ead
"
C,.
(I
ig
.
167
/1 ).
The pulse sent by the
mag
neti
c
pickup
is
ind
epen-
dant from
t
he
batte ry
vollag!).
b
Warning
•
Reversing
the
batt
ery po
les
ca
n
cause da
mage
to
the
electronic
box.
•
To re-
ch
arge
battery
il
is advisab
le
10 disconnec
l
It f rom the
electric
,,1
system to
prevent
damaging the
e lec /ronic
box.
This "pplies
also whenever any
wel-
ding operation
is
done
on
the vehicle
Irame.
•
T he
HT
coils
",nd
the
etectr
on ic boxes
are p ur-
posed
ly
IOC8
ted
in
welt
ventilated
posi
tio
ns
to
allow
a correct
heat
dispersion.
It
is
recommended,
there
lore, not to
make any c han-
ges
or
modilications that
may red
uce
or
hinder
the
air
flow
to
these
components.
•
W,lh
the
engine
still, don't
forge
t
to
disconnect
the
ig
nr
lion
SWitc
h
to p
revent
balery discharge o
r
possible
damage 0 the ign itio
n
system (especially
the
H
T.
co
ils).
c
Data lor
electrically
checking the
magnetic pickups
In ca
se
of irregular igniti
on
opera tion, c heck
the
e ff
i-
ciency 01 th
e
pi
ckups
:
•
Circuit
res istance w
ith
piCk
up
body
at th
e
tempe-
rature of about
20'
C
(68'
F)
:
220
Ohm
::!:
15.
For this
test
use a ohmmete
r
connecte
d
to
t he
cab le
termin
a ls
01
the
pickup.
L
-__________________________
~~7
167/1
101
Advertisement
Table of Contents
